Question

porfa es para ahora ​

Answer 1

Respuesta:

when did you started investugating about ecological disasters?

what were you focused on first? (creo)

have you carried on any experiment?

how long have you studied for this?

since when you work here?

have you already travel to USA?

Explicación:

LA Vdd no sé si la consigna dice como debes de formular las preguntas pero bueno espero que te sirva